{"product_id":"carrier-ph11ja018000aaaa-contactor-1iwybu","title":"OEM Carrier Contactor 24V Coil 2-Pole for PH11JA018000AAAA","description":"\u003ch1\u003eOEM Carrier 2-Pole Contactor 24V Coil (HN51KB024) for Model PH11JA018000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement contactor for the \u003cstrong\u003eCarrier PH11JA018000AAAA\u003c\/strong\u003e heat pump system. The contactor is the high-voltage switching relay that receives a 24V signal from the thermostat or control board and closes the circuit to energize the compressor and condenser fan motor. When the contactor fails — due to burned contacts, a stuck armature, or a failed coil — the outdoor unit will not start even though the thermostat is calling for cooling or heating. In some cases, a failed contactor can also weld shut, causing the unit to run continuously regardless of thermostat demand.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 2-Pole configuration | 24V AC coil voltage | Factory-rated amperage for Carrier PH11JA018000AAAA | OEM part number HN51KB024\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM contactor features factory-spec silver-alloy contact points rated for exact load tolerances of your system. Generic contactors often use lower-grade contacts that arc and pit faster, leading to premature failure and potential compressor damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Always disconnect power at the breaker and confirm voltage is absent with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, 1\/4\" and 5\/16\" nut drivers, needle-nose pliers, multimeter. Photograph all wiring connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. Orders placed before cutoff ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003ePH11JA018000AAAA\u003c\/strong\u003e heat pump. Always verify coil voltage and pole configuration against your unit's wiring diagram and data plate before ordering. Need fitment confirmation? Our HVAC parts specialists are standing by — we verify compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641977721203,"sku":"CARRIE-PH11JA018000AAAA-CONTACTOR-HN51KB024","price":68.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641977753971,"sku":"CARRIE-PH11JA018000AAAA-CONTACTOR-HN51KB024-GEN","price":60.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-contactor-HN51KB024_a567ceef-f3b5-4239-8844-ef12890862e7.jpg?v=1775022084","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph11ja018000aaaa-contactor-1iwybu","provider":"National HVAC Parts","version":"1.0","type":"link"}